package com.fenyin.samples.study.securty;  

import java.security.MessageDigest;
  
public class MD5Client {
	public final static String MD5(String s) {  
		  char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',  
		    'a', 'b', 'c', 'd', 'e', 'f' };  
		  try {  
		   byte[] strTemp = s.getBytes();  
		   MessageDigest mdTemp = MessageDigest.getInstance("MD5");  
		   mdTemp.update(strTemp);  
		   
		   byte[] md = mdTemp.digest();  
		   int j = md.length;  
		   char str[] = new char[j * 2];  
		   int k = 0;  
		   for (int i = 0; i < j; i++) {  
		    byte byte0 = md[i];  
		    str[k++] = hexDigits[byte0 >>> 4 & 0xf];  
		    str[k++] = hexDigits[byte0 & 0xf];  
		   }  
		   return new String(str);  
		  } catch (Exception e) {  
		   return null;  
		  }  
		 }  
		  
		 public static void main(String[] args) {  
		  // MD5_Test aa = new MD5_Test();  
		  System.out.print(MD5Client.MD5("fengzhichao"));  
		 }  
}
